presumably trying to simulate the composite tri-spoke wheels but extended to give more stability as spokes are being used. In theory they focus the force from the hub onto the rim and therefore onto the tyre. Coming back the spokes attach to the hub on opposite sides of the rim so that the force is spread out further across the hub in order to enhance that force onto the stays and therefore the frame.

I think I saw it called G3 spokes but it might be G-somethingelse. I'm looking for wheels which will be good for entry level TT on a budget...it's either Vento or Aksiums so I was wondering if there was any benefit in the spoke patterns of Ventos over the radial spokes of Aksiums. From your (non) scientific description it sounds as if there may be...but I can't work out why not radial on front wheel as it would make more sense (based on my very limited knowledge of these things )

I think I saw it called G3 spokes but it might be G-somethingelse. I'm looking for wheels which will be good for entry level TT on a budget...it's either Vento or Aksiums so I was wondering if there was any benefit in the spoke patterns of Ventos over the radial spokes of Aksiums. From your (non) scientific description it sounds as if there may be...but I can't work out why not radial on front wheel as it would make more sense (based on my very limited knowledge of these things )

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Aksiums have bladed spokes so would be faster than Ventos with round spokes.

I've done almost 3000 miles of commuting and group rides and haven't needed to touch them.

I'm actually about to drop them off for a service as they are ever so slightly out of true but hardly noticeable. I'll also get the hubs re-greased. Perhaps not ideal for TTs but good wheels.
I would only get the Aksiums if you have an authorised Mavic service centre near by. The spokes aren't standard so won't be stocked by your average LBS and Mavic only give the proper tools to the authorised centres. The nipples also have a habit of fusing themselves to the spokes.

Between the 2 get the Campags. You can always get them re-laced later.